Outside the Soviet Union, Communism Collapsed in Central and Eastern

Outside the Soviet Union, communism collapsed in central and eastern European countries for all of the following reasons except

A) inflation and unemployment were rising rapidly.
B) dissidents in the east were criticizing governments and calling for a recognition of the human rights guaranteed by the Helsinki accords.
C) infrastructure was decaying and the environment was deteriorating.
D) since the 1970s, east European economies had stagnated.